Four resistors having resistances R,2R,3R and 4R are each connected separately across the same ideal battery. Which of the following correctly ranks the power dissipated by them from highest to lowest?
a) 2R>R>3R>4R
b) R>2R>3R>4R
c) 4R>3R>2R>R
d) R>3R>2R>4R